^Honestly? Probably not that many. I mean we can tell if people are related, but there is so many genes that can mix over generation that's not many genes are the same.
You share only 50% genes with your sibling, if you have same great-grandparents you only have around 3.5% of the same genes. And it's halves from generation to generation. Same greatx4-grandparents you only share 0.1% so basically nothing.
Hell that's the reason many countries allow for marrying your cousins (and some even your half-siblings).
Damn I just checked and there are countries where same-sex incest is legal. Hell Japan have full legal incest for adults. It explain anime fixation on incest stuff.
last edited at Aug 5, 2025 6:43PM